Method of molding artificial stone.



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METHOD 0F HOLDING ARTIFICIAL STONEL (Application led my 14, 1902;.)

(No Model.)

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FRANK ORLIKOIVSKI, OF CLEVELAND, O HIO.

METHOD OF IVIOLDING ARTIFICIAL STONE.

SPECIFICATION forming part of Letters Patent No. 708,248, dated September 2, 1902.

Application iiled May 14, 1902. Serial No. 107,264. (No specimens.)

ing artificial stone; and the invention com? prises a new article of manufacture and the method of making the same, allsubstantially as shown and described, vand particularly pointed out in the claim.

In the accompanying drawings, Figure l is a perspective view of the new stone made by my improved method. Fig. 2 is a sectional elevation of a liask in which the stone is manufactured, showing a layer or quantity of broken stone therein and representing the rst step in the process. Figs. 3 and-l: are like views of the flask to Fig. l and showing successive steps in the process of manufacture. next layer of stone, and in Fig. 4 this has been supplied and the stone presumably has been nished by the addition of cement and the final tamping.

The article thus produced and shown complete in Fig. l is designed to be used chiefiy for street pur poses-such as cross-walks,curb stones, and the like; but its greater value in street work is as a substitute for the expensive granite stones otherwise necessarily used for laying cross-walks. Now referring especially to the method of producing this new article, I employ a iask or mold A of anysuitable size and shape, accordingto the form of stone to be made, and the said flask is open top and bottom and laid on a solid iioor, paved or unpaved. Said liask is iilled first with a layer of broken stones B, which may. be any hard and serviceable stone like granite; but generally and preferably I take cobblestones, or what are known as niggerheads and which generally are found abundantly in cities as cast-aways from old paving and break them into pieces proportionately as large as a hens egg or thereabout.

In Fig. 3 the Work is ready for the.

Stone of this kind has the most durable wearing quality known, and by Working it up into comparatively small pieces and packing the pieces firmly together in close layers at the surface of the stone I get aproduct practically equal in Wearing quality and usefulness to the best solid granite stone, but very materially cheaper in cost. Now having placed a layer of stone pieces in flask A, I ll in upon the same a suitable quantity of cement mixture C of the consistency, say, of mortar as it is applied in plastering a wall. Possibly my cement is even somewhat thicker than this, but still it is adapted to flow sufficientlyto be driven into the interstices of the 'stone piecesB under the heavy tamping I give and pack in with them as if they were originally mixed together. This done and thoroughly tamped, so as to make a firm and solid mass, it depends on the depth of the cement over the stones whether I then add more cement or place thereon the next layer of stone B, which comesin the top of the liask and may be described as also the top of the stone. Then having added this stone layer and the requisite cement and after tamping this down as iirmly as two men can tamp the material the workof manufacture may be regarded as,

done, at least as far as all hand work is concerned. Then after the stone has hardened sufficiently the flask is removed and the stone is taken away. The cement mixture used by me in this manufacture consists of suitable quantities or proportions of Portland cement, cinder-slack dust, and Cobblestone dust. This mixture itself becomes exceedingly hard and firm and has excellent wearing quality,

besides'being a perfect binder for the stone.

In this way IY produce the stone seen in Fig. l,4 which has the advantage of a practically all-stone Wearing-surface on each side with a filling and body of cement which will endure for an indenite period, and asone side of the stone becomes worn away, as of course it Will in time, the stone can be reversed anda new side as good as the original be presented for service. Any equivalents of the cinderslack and Cobblestone-dust used in making the cement mixture may of course be employed in lieu of these ingredients. By

cinder-slack I mean pulverized cinder of the kind found about rollin g-mills and iron works,

IOO

and Cobblestone-dust is the finer sifting of the residue obtained in crushing cobblestones for my use. In such operation of crushing there is produced a considerable body of reduced material, and this I screen and take out the finer portions, While the larger mass can be further reduced in a special crusher, ifneeded. It is Very heavy and becomes very solid with Portland cement. The solid packing quality of cinder-dust is likewise known.

What I claim is- The method of making artificial stone consisting in placing Within a suitable ask a compact layer of hard stone pieces; then covering said pieces at a suitable depth with 

